package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.SetmealService;
import com.sky.vo.DishItemVO;
import com.sky.vo.SetmealVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
@Slf4j
public class SetmealServiceImpl implements SetmealService {
    @Autowired
    private SetmealMapper setmealMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private DishMapper dishMapper;

    /**
     * 新增套餐
     * @param setmealDTO
     */
    @Override
    @Transactional   // 开启事务管理
    public void addSetmeal(SetmealDTO setmealDTO) {

        // 复制套餐属性
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);
        // 向套餐表中插入数据
        setmealMapper.insert(setmeal);

        // 获取套餐生成的id
        Long setmealId = setmeal.getId();

        // 向菜品和套餐关联表插入数据
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        setmealDishes.forEach(setmealDish -> {
            setmealDish.setSetmealId(setmealId);
        } );
        setmealDishMapper.insertBatch(setmealDishes);

    }

    /**
     * 套餐分页查询
     * @param setmealPageQueryDTO
     * @return
     */
    @Override
    public PageResult page(SetmealPageQueryDTO setmealPageQueryDTO) {
        // 利用分页小插件
        PageHelper.startPage(setmealPageQueryDTO.getPage(),
                setmealPageQueryDTO.getPageSize());
        Page<SetmealVO> page = setmealMapper.pageQuery(setmealPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 批量删除
     * @param ids
     */
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {

        // 起售中的套餐不能删除
        ids.forEach(id ->{
           Setmeal setmeal = setmealMapper.getById(id);
           if (setmeal.getStatus() == StatusConstant.ENABLE){
               throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
           }
        });

        ids.forEach(setmealId -> {
            // 删除套餐表中的数据
            setmealMapper.deleteById(setmealId);
            // 删除套餐菜品关系表中的数据
            setmealDishMapper.deleteBySetmealId(setmealId);
        });

    }

    /**
     * 根据套餐id查询套餐
     * @param id
     * @return
     */
    @Override
    public SetmealVO getById(Long id) {
        // 查询套餐数据
        Setmeal setmeal = setmealMapper.getById(id);
        SetmealVO setmealVO = new SetmealVO();
        BeanUtils.copyProperties(setmeal, setmealVO);

        // 查询套餐关联的菜品数据
        List<SetmealDish> setmealDishes = setmealDishMapper.getDishBySetmealId(id);
        setmealVO.setSetmealDishes(setmealDishes);
        return setmealVO;
    }

    /**
     * 修改套餐
     * @param setmealDTO
     */
    @Override
    @Transactional
    public void update(SetmealDTO setmealDTO) {
        // 修改套餐表
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);
        setmealMapper.update(setmeal);

        // 修改关联数据表 先删除再插入
        // 获取套餐id
        Long setmealId = setmealDTO.getId();
        // 删除关联菜品数据
        setmealDishMapper.deleteBySetmealId(setmealId);

        // 新插入关联菜品数据重
        // 先关联套餐id
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        setmealDishes.forEach(setmealDish -> {
            setmealDish.setSetmealId(setmealId);
        });
        // 批量插入
        setmealDishMapper.insertBatch(setmealDishes);

    }

    /**
     * 起售与禁用套餐
     * @param status
     */
    @Override
    public void updateStatus(Integer status, Long setmealId) {
        //起售套餐时，判断套餐内是否有停售菜品，有停售菜品提示"套餐内包含未启售菜品，无法启售"
        if (status == StatusConstant.ENABLE){

            // 根据套餐id查询菜品
            // select a.* from dish a left join setmeal_dish b on a.id = b.dish_id where b.setmeal_id = ?
            List<Dish> dishList = dishMapper.getBySetmealId(setmealId);
            if(dishList.size() > 0 && dishList != null){
                dishList.forEach(dish -> {
                    if (dish.getStatus() == StatusConstant.DISABLE){
                        throw new
            SetmealEnableFailedException(MessageConstant.SETMEAL_ENABLE_FAILED);

                    }
                });
            }
        }

        Setmeal setmeal = Setmeal.builder()
                .id(setmealId)
                .status(status)
                .build();

        setmealMapper.update(setmeal);
    }

    /**
     * 条件查询
     * @param setmeal
     * @return
     */
    public List<Setmeal> list(Setmeal setmeal) {
        List<Setmeal> list = setmealMapper.list(setmeal);
        return list;
    }

    /**
     * 根据id查询菜品选项
     * @param id
     * @return
     */
    public List<DishItemVO> getDishItemById(Long id) {
        return setmealMapper.getDishItemBySetmealId(id);
    }

}
